Fan-ventilator.



No. 868,206 PATENTED OCT. 15, 1907.

J. W. MILLER.

FAN VENTILATOR. APPLICATION FILED JAN. 16, 1905.

inuewoiyioy JAMES W. MILLER, OF GILLESPIE, ILLINOIS.

FAN-VENTILATOR.

Specification of Letters Patent.

Patented Oct. 15, 1907.

Application filed January 16,1905. Serial No. 241,207.

To all whom it may concern:

Be it known that I, JAMES W. MILLER, acitizen of the nited States, residing at Gillespie, in the county of Maconpin and State of Illinois, have invented a certain new and useful Fan-Ventilator, of which the following is a specification.

; The objects of my invention are to provide a fan of simple, durable and inexpensive construction especially designed for use in connection with mine ventilation and capable of being formed principally of plate metal pieces riveted together and so arranged that the fan will offer a minimum of resistance to the admission of air through the eyes of the inn and to the discharge of air from the fan blades.

My invention consists in the construction ol the inn, whereby the objects contemplatcd are attained, as hereinafter more fully st-t l'orth, pointed out in my claims and illustrated in the accom ninying drawings, in which Figure 1 shows a side elevation of the complete tan with a portion of one oi the outer rims rcmovcd. Fig.

2 shows a vertical transverse sectional. view of the complcte fan, and Fig. 3 shows an enlarged detail view on the line 33 of Fig. 2.

Referring to the accompanying drawings, the numeral 10 is used to indicatc'the l'an shaft formed with key-ways 11 at opposite sides of its center. The fan hub is composed of two mating sections 12 and 13 each section kcycd to the shaft by a key 14. outer end of each hub section is curved gradually from a point adjacent to thc shalt inwardly toward the centcr of the shaft and their in a direction at about right angles to the shaft The fan proper is composed of a central disk made of plate metal segments. In tho prcscnt. instance four are shown. Thcse segments are indicated by the numeral 15, their outer edges forming a complete circle and their inner margins introduced bctwccn the hub sections 12 and i3 and lirmly secured therein by bolts 16. Each fan blade is composrd oi twoplate metal sections 17 and 18. The outcr edge of each is parallel with the shaft and the inner cdgc inclines from the central disk l5 ontwanlly and away from the shaft. Each of the plates i7 is curved near its outer end at 19 in a direction for inclining the outer end rcarwardly relative to the line of rotation of the fan. I connect the fan sections 17 and 18 with thecontral disk 15 as follows. On each side of the ccntral disk is an angle bar 20 riveted to the central disk 15andalso riveted to the adjacent blade section. Each fan sec- The l l l iormcd with a relatively large opening or eye.

tion, therefore, is composed of two plates, the inner side edges of the plates standing adjacent to the pcriphery of the hub and the outer side edge oi each blade spaced apart a considerable distance from the axle10.

blades and also to the rims 21 and 22 and by this arrangement the outer side edges of the blades and the said rims 2] and 22 serve to mutually support and bra cc each other.

With the exception of the hub, the entire fan is composed of plate metal pieces of relatively small size so that. they may be easily and conveniently shaped and put together. The fan when completed is of rcla tivcly great strength because the parts mutually support: and brace each other and the admission of air through the eyes of the ian at the sides is not in any way obstructed but is wholly clear and open so that a fan of great elliciency is provided.

Having thus described my invention. what I claim and desire to secure by- Letters Patent of the United States, therefor is 'ihc combination in a fan for the purpose described. of two lUIlt SlHlpLd hub sections arranged with their large portions inward and adjaccnt to each other. an annular central disk fixed between and extending radially from the -lnncr large portions of the hub scctious. annular side rims. angle-bars tiXcd to opposite sides of the central disk and having innor straight portions disposed radially to thc ccntcr of the fan and also having outer portions .curvcd outward and rearward. with reference to the dircction in which the fan is rotated. correspondingly arranged and shapcd angle bars tixr-d to the inner sides of the side rims, and radial blade sections located at oppo site sides of the central disk and iixcd to the angle bars on the disk and side rims and having their outer end portions curi'cd rearward. with reference to the direction in which the fan is rotated.

Des )loincs, Iowa. Nov. 4, 1904.

JAMES W. MILLER.

Witnesses J; B. BENNETT, I A. TRAIIIN.

. Tire fan is completed by the two outer side rims 21 

